feat(ton): Fix C++ interface

* Add Kotlin, Swift tests

android/app/src/androidTest/java/com/trustwallet/core/app/utils/TestCryptoBox.kt

@@ -0,0 +1,29 @@
+package com.trustwallet.core.app.utils
+
+import com.trustwallet.core.app.utils.toHexBytes
+import com.trustwallet.core.app.utils.toHex
+import org.junit.Assert.*
+import org.junit.Test
+import wallet.core.jni.*
+
+class TestCryptoBox {
+    init {
+        System.loadLibrary("TrustWalletCore")
+    }
+
+    @Test
+    fun testEncryptDecryptEasy() {
+        val mySecret = CryptoBoxSecretKey()
+        val myPubkey = mySecret.publicKey
+
+        val otherSecret = CryptoBoxSecretKey()
+        val otherPubkey = otherSecret.publicKey
+
+        val message = "Well done is better than well said. -Benjamin Franklin"
+        val encrypted = CryptoBox.encryptEasy(mySecret, otherPubkey, message.toByteArray())
+
+        // Step 2. Make sure the Box can be decrypted by the other side.
+        val decrypted = CryptoBox.decryptEasy(otherSecret, myPubkey, encrypted)
+        assertEquals(decrypted.toString(Charsets.UTF_8), message)
+    }
+}

include/TrustWalletCore/TWCryptoBoxPublicKey.h

@@ -11,7 +11,7 @@
 TW_EXTERN_C_BEGIN
 
 /// Public key used in `crypto_box` cryptography.
-TW_EXPORT_STRUCT
+TW_EXPORT_CLASS
 struct TWCryptoBoxPublicKey;
 
 /// Determines if the given public key is valid or not.

include/TrustWalletCore/TWCryptoBoxSecretKey.h

@@ -33,6 +33,6 @@ void TWCryptoBoxSecretKeyDelete(struct TWCryptoBoxSecretKey* _Nonnull key);
 /// \param key *non-null* pointer to the private key.
 /// \return *non-null* pointer to the corresponding public key.
 TW_EXPORT_METHOD
-struct TWCryptoBoxPublicKey* TWCryptoBoxSecretKeyGetPublicKey(struct TWCryptoBoxSecretKey* _Nonnull key);
+struct TWCryptoBoxPublicKey* _Nonnull TWCryptoBoxSecretKeyGetPublicKey(struct TWCryptoBoxSecretKey* _Nonnull key);
 
 TW_EXTERN_C_END

swift/Tests/CryptoBoxTests.swift

@@ -0,0 +1,24 @@
+// SPDX-License-Identifier: Apache-2.0
+//
+// Copyright © 2017 Trust Wallet.
+
+import WalletCore
+import XCTest
+
+class CryptoBoxTests: XCTestCase {
+    func testEncryptDecryptEasy() {
+        let mySecret = CryptoBoxSecretKey()
+        let myPubkey = mySecret.getPublicKey()
+
+        let otherSecret = CryptoBoxSecretKey()
+        let otherPubkey = otherSecret.getPublicKey()
+
+        let message = "Well done is better than well said. -Benjamin Franklin"
+        let encrypted = CryptoBox.encryptEasy(mySecret: mySecret, otherPubkey: otherPubkey, message: Data(message.utf8))
+
+        // Step 2. Make sure the Box can be decrypted by the other side.
+        let decrypted = CryptoBox.decryptEasy(mySecret: otherSecret, otherPubkey: myPubkey, encrypted: encrypted)!
+        let decryptedStr = String(bytes: decrypted, encoding: .utf8)
+        XCTAssertEqual(decryptedStr, message)
+    }
+}